Variation of Global Precipitation Patterns

As has been mentioned several times, the position of the precipitation zones is dependent on the season or, in other words, on the Sun's position. Thus, the heavy-rainfall areas in the tropics shift significantly to the north in July-August (Figure 2). At the same time the dry areas in the subtropics also extend toward the north, so that they cover, for example, the Mediterranean region.

In the period from December to February (Figure 3), considerably less precipitation occurs in the Northern Hemisphere than in the period July-August. This is due to the shift of the heavy-rainfall areas to the Southern Hemisphere, caused again by the Sun's position. Exceptions to this general rule are, for example, the western coast of the United States and Canada and the

Month

Figure 8 Monthly mean of precipitation, Berlin, 52°28' N, 13° 18' E (annual sum = 586 mm).

Month

Figure 8 Monthly mean of precipitation, Berlin, 52°28' N, 13° 18' E (annual sum = 586 mm).

Month

Figure 9 Monthly mean of precipitation, Tromsoe, 69°40' N, 18°56' E (annual sum = 1000 mm).

Month

Figure 9 Monthly mean of precipitation, Tromsoe, 69°40' N, 18°56' E (annual sum = 1000 mm).

Figure 10 Monthly mean of precipitation, Rome, 41°32' N, 12°17' E (annual sum = 880 mm).

Figure 10 Monthly mean of precipitation, Rome, 41°32' N, 12°17' E (annual sum = 880 mm).

Mediterranean region, which have more precipitation due to the intensified westerly wind circulation.

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